Share Exothermic Reactions
Save to Folder
What is an exothermic reaction?
A reaction that releases heat to its surroundings
A reaction with no temperature change
A reaction that absorbs heat from its surroundings
Which of the following is an exothermic reaction?
Combustion of methane
Evaporation of water
Melting of ice
What is another name for combustion?
Freezing
Rusting
Burning
What are the products of a reaction between magnesium and hydrochloric acid?
Magnesium hydroxide and hydrogen
Magnesium chloride and hydrogen
Magnesium chloride and oxygen
Which of the following reactions is exothermic?
Boiling of water
Melting of wax
Freezing of water
What happens to the temperature of the surroundings during an exothermic reaction?
It remains constant
It increases
It decreases
Which of the following is a common example of an exothermic reaction?
Respiration
Dissolving salt in water
Photosynthesis
What is released during combustion?
Nitrogen
Oxygen
Carbon dioxide and heat
Why is combustion considered an exothermic reaction?
It cools down the surroundings
It absorbs heat from the surroundings
It produces heat and light energy
What is one way to prevent heat loss during an exothermic reaction experiment?
Use an insulated container
Use a metal container
Conduct the reaction in an open space
Which of the following would release energy when cooled?
Ice melting to water
Water boiling to steam
Steam condensing to water
What kind of energy change occurs in exothermic reactions?
No energy change occurs
Energy is released into the surroundings
Energy is absorbed into the system
What is the general equation for combustion of a hydrocarbon?
Hydrocarbon + oxygen → carbon monoxide + heat
Hydrocarbon + oxygen → carbon dioxide + water + heat
Hydrocarbon + water → carbon dioxide + heat
Which of the following is an example of an exothermic reaction involving a salt?
Potassium nitrate decomposing to form potassium nitrite and
Sodium hydroxide dissolving in water
Calcium chloride dissolving in water
Which of the following is an exothermic phase change?
Melting of ice
Boiling of water
Freezing of water
Why does temperature increase during an exothermic reaction?
Reactants gain energy
Energy is released into the surroundings
Heat is absorbed into the surroundings
